Mobile Relay Timing Coordination for Collision-Resilient IoT Links
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Solution Overview
Problem
Existing IoT systems face challenges in determining efficient transmission timings for IoT terminals communicating with mobile relay stations, leading to potential data collisions and reduced communication reliability due to varying positional relationships and communication volumes.
Innovation Solution
A wireless communication system where relay devices on mobile objects, such as LEO satellites, communicate with multiple IoT terminals by transmitting and receiving test signals to identify optimal transmission timings based on communication situations, allowing terminals to synchronize their transmissions with the relay device at the best available times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If IoT terminals transmit data autonomously at different timings to avoid collisions, then data collision is reduced, but communication reliability deteriorates due to varying positional relationships with mobile relay stations
Solution Approach 1:
The system implements feedback mechanisms where terminals receive communication situation information from relay devices about channel conditions, and adjust their transmission timings accordingly. This feedback loop allows terminals to maintain reliable communication while avoiding collisions by adapting to changing positional relationships with mobile relay stations.
Solution Approach 2:
The system dynamically adjusts transmission timings based on real-time communication situations rather than using fixed autonomous schedules. Terminals can flexibly modify their transmission timing to account for the changing positional relationships with mobile relay stations, thereby maintaining both collision avoidance and communication reliability.
2Object-generated harmful factors
If terminals transmit data at fixed autonomous timings, then collision avoidance is achieved, but communication efficiency deteriorates due to varying communication congestion levels
Solution Approach 1:
The system uses feedback from communication situation information to dynamically adjust transmission timings. Terminals receive information about current channel conditions and congestion levels, allowing them to optimize their transmission timing to balance collision avoidance with efficient use of available communication resources.
Solution Approach 2:
The system changes the transmission timing parameter dynamically based on communication situation information. Instead of fixed timings, terminals adjust their transmission timing parameter in response to varying congestion levels, achieving both collision avoidance and improved communication efficiency.
3Loss of energy
If LEO satellites are used as relay stations, then propagation loss and delay are reduced, but communication availability deteriorates due to limited visible time periods
Solution Approach 1:
The system performs preliminary determination of transmission timings before the actual data transmission occurs. By using communication situation information to pre-establish optimal transmission timing, the system maximizes the utilization of the limited visible time period while maintaining low propagation loss characteristics of LEO satellites.
Solution Approach 2:
Terminals autonomously determine their transmission timings based on received communication situation information without requiring continuous relay station control. This self-service approach allows terminals to efficiently utilize the limited communication window provided by LEO satellites, improving overall communication availability.
Data Source
AI summary
In a wireless communication system in which a relay device provided on a mobile object communicates wirelessly with a plurality of communication devices present in places different from each other, each of the communication devices includes a communication device transmission unit which transmits test signals at a plurality of timings during a time frame when communication with the relay device is possible, a communication device reception unit which receives, from the relay device, communication situation information indicating communication situations at the plurality of timings, and a communication device control unit which controls the communication device transmission unit such that the communication device transmission unit communicates with the relay device at one of the plurality of timings, the communication situation of which is good and which is identified on the basis of the communication situation information, and the relay device includes a relay device reception unit which receives the respective test signals at the plurality of timings, a measurement unit which measures the respective communication situations at the time of reception of the test signals at the plurality of timings, a relay device control unit which generates the communication situation information on the basis of the communication situations, and a relay device transmission unit which transmits the communication situation information to the communication device during a time frame when communication with the communication device is possible.